KEYWORDS: Receivers, Free space optics, Signal detection, Digital signal processing, Hybrid optics, Polarization, Multiplexing, Oscillators, Multiplexers, Phase shift keying
A novel parallelized few-mode receiver for mode-division multiplexed transmission systems has been proposed and demonstrated based on the orthogonality among spatial eigenmodes. The receiver includes only one free-space 90-degree optical hybrid without the need for mode demultiplexing. A 2× 20 Gb/s QPSK 2-mode back-to-back (BTB) transmission system was demonstrated experimentally.
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